Weather

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Adam Pankoke, left, and Nick Streit, clear fallen trees in Beaver Crossing, Neb., Monday, May 12, 2014. Beaver Crossing was hit hard after several tornadoes moved across Nebraska on Sunday causing damage to homes and businesses in or near Sutton, Garland, Cordova and Daykin. The storms also left more than 18,000 utility customers without electricity. (AP Photo/Nati Harnik)

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Nebraska Gov. Dave Heineman, accompanied by Clay County EMA official Loren Uden, right, surveys damage to downtown Sutton, Neb., Monday, May 12, 2014, after a tornado touched down in town on Sunday. Several tornadoes moved across Nebraska on Sunday causing damage to homes and businesses in or near Sutton, Garland, Cordova, Beaver Crossing and Daykin. The storms also left more than 18,000 utility customers without electricity. (AP Photo/Nati Harnik)

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CORRECTS CREDIT TO CHRIS MACHIAN - In this Sunday May 11, 2014 photo, a wall cloud that spawned a tornado warning forms northwest of Dorchester Neb. Sunday's storms caused damage across much of eastern Nebraska roughly on a line from the Kansas border up through Hastings and Omaha. No serious injuries were reported. (AP Photo/The World-Herald, Chris Machian) MAGS OUT TV OUT

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Water flows down a canyon past fresh snow, at Eldorado Canyon State Park, in Eldorado Springs, Colo., on Monday, May 12, 2014. A spring storm has brought up to 3 feet of snow to the Rockies and severe thunderstorms and tornadoes to the Midwest. In Colorado, the snow that began falling on Mother's Day caused some power outages as it weighed down newly greening trees. (AP Photo/Brennan Linsley)

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Commuters pass fresh snow from the fringe of a major spring snowstorm in the nearby mountains, in Superior, Colo., on Monday, May 12, 2014. A spring storm has brought up to 3 feet of snow to the Rockies and severe thunderstorms and tornadoes to the Midwest. In Colorado, the snow that began falling on Mother's Day caused some power outages as it weighed down newly greening trees. (AP Photo/Brennan Linsley)

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Volunteers clear bricks and debris from the roof of a building in Beaver Crossing, Neb., Monday, May 12, 2014. Beaver Crossing was hit hard after several tornadoes moved across Nebraska on Sunday causing damage to homes and businesses in or near Sutton, Garland, Cordova and Daykin. The storms also left more than 18,000 utility customers without electricity. (AP Photo/Nati Harnik)

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Hector Rodrigues clears snow from a driveway to a parking structure in Denver on Monday, May 12, 2014. A spring storm that has brought over a foot of snow to parts of Colorado, Wyoming and Nebraska and thunderstorms and tornadoes to the Midwest was slowing down travelers and left some without power Monday morning. (AP Photo/Ed Andrieski)

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Commuters pass fresh snow from the fringe of a major spring snowstorm in the nearby mountains, in Louisville, Colo., on Monday, May 12, 2014. A spring storm has brought up to 3 feet of snow to the Rockies and severe thunderstorms and tornadoes to the Midwest. In Colorado, the snow that began falling on Mother's Day caused some power outages as it weighed down newly greening trees. (AP Photo/Brennan Linsley)

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High school students walk past fresh snow from the fringe of a major spring snowstorm in the nearby mountains, in Boulder, Colo., on Monday, May 12, 2014. A spring storm has brought up to 3 feet of snow to the Rockies and severe thunderstorms and tornadoes to the Midwest. In Colorado, the snow that began falling on Mother's Day caused some power outages as it weighed down newly greening trees. (AP Photo/Brennan Linsley)

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A hummingbird perches on a branch covered in fresh snow from a spring snowstorm, at Eldorado Canyon State Park, in Eldorado Springs, Colo., on Monday, May 12, 2014. A spring storm has brought up to three feet of snow to the Rockies and severe thunderstorms and tornadoes to the Midwest. In Colorado, the snow that began falling on Mother's Day caused some power outages as it weighed down newly greening trees. (AP Photo/Brennan Linsley)

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In this Sunday May 11, 2014 photo, Carlos Estrada watches a wall cloud that spawned a tornado warning northwest of Dorchester, Neb. Nebraskans are beginning to clean up debris and assess the damage this weekend's severe thunderstorms and tornadoes left behind. (AP Photo/The Omaha World-Herald, Chris Machian) MAGS OUT; ALL NEBRASKA LOCAL BROADCAST, TV OUT

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Brian Pryor clears snow from the tree limbs in front of his home on University Hill in Boulder, Colo., on Monday, May 12, 2014. A spring storm that has brought over a foot of snow to parts of Colorado, Wyoming and Nebraska and thunderstorms and tornadoes to the Midwest was slowing down travelers and left some without power Monday morning. (AP Photo/The Boulder Daily Camera, Paul Aiken) NO SALES

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Heavy snow weighs down trees and bushes as a woman runs in Washington Park in Denver on Monday, May 12, 2014. A spring storm that has brought over a foot of snow to parts of Colorado, Wyoming and Nebraska and thunderstorms and tornadoes to the Midwest was slowing down travelers and left some without power Monday morning. (AP Photo/Ed Andrieski)

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A biker passes fresh snow from the fringe of a major spring snowstorm in the nearby mountains, in Superior, Colo., on Monday, May 12, 2014. A spring storm has brought up to 3 feet of snow to the Rockies and severe thunderstorms and tornadoes to the Midwest. In Colorado, the snow that began falling on Mother's Day caused some power outages as it weighed down newly greening trees. (AP Photo/Brennan Linsley)

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Fresh snow from a spring snowstorm covers a hillside in Boulder, Colo., on Monday, May 12, 2014. A spring storm has brought up to three feet of snow to the Rockies and severe thunderstorms and tornadoes to the Midwest. In Colorado, the snow that began falling on Mother's Day caused some power outages as it weighed down newly greening trees. (AP Photo/Brennan Linsley)

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James Koolhof surveys the damage at his home on Lake Panorama, Iowa, Monday, May 12, 2014. At least eight condos in the Boulder Cover Condo Association were heavily damaged after a storm ripped through two sections of Lake Panorama, Sunday, May 11, 2014. The National Weather Service plans to send a survey team to the area to determine whether the damage was caused by a tornado. (AP Photo/The Des Moines Register, Zach Boyden-Holmes)

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Emilia Merritt, 18, looks at the damage to her car after a tree fell during a storm at her home on Panorama Dr. in Lake Panorama, Iowa, Monday, May 12, 2014. At least eight condos in the Boulder Cover Condo Association were heavily damaged after a storm ripped through two sections of Lake Panorama, Sunday, May 11, 2014. The National Weather Service plans to send a survey team to the area to determine whether the damage was caused by a tornado. (AP Photo/The Des Moines Register, Zach Boyden-Holmes)